#include"add.h"
#include"sub.h"

int main()
{
  int x = 10;
  int y = 20;

  int r1 = my_add(x, y);
  int r2 = my_sub(x, y);

  printf("add:%d\n", r1);
  printf("sub:%d\n", r2);
  return 0;
}
